Open Tag: An Open-Source Claude Tag for Claude Code and Codex

Introduces Open Tag, an open-source implementation of the Claude Tag pattern, leveraging the MFS (Multi-source File-like Search) system. Details the architecture of Open Tag, highlighting MFS as the core component for agent memory and tools. Explains MFS's design principles: a unified URI interface across heterogeneous sources and a retrieval loop combining search and browse. Demonstrates Open Tag's functionality with examples of local installation, agent-guided configuration, and a real-world PR review. Discusses the engineering problem of enabling agents to search and retrieve context from multiple isolated systems efficiently.